Territory Stories

Soil and Land Assessment of the Southern Part of Flying Fox Station for Irrigated Agriculture. Part A: Land Resources and General Land Capability.

Details:

Title

Soil and Land Assessment of the Southern Part of Flying Fox Station for Irrigated Agriculture. Part A: Land Resources and General Land Capability.

Other title

Agricultural Land Suitability Series, Report 14A

Creator

Andrews, K; Burgess, J; McGrath, N; Wright, A; Walton, S; Northern Territory. Department of Environment, Parks and Water Security

Editor

Hill, J.V.

Collection

E-Publications; E-Books; PublicationNT; Technical Report No. 3/2021

Date

2021-03-01

Location

Flying Fox Station; Roper River Region

Description

This report presents findings from a 52 938 ha soil and land resource mapping investigation of the southern part of Flying Fox Station, in the Roper River Region of the Northern Territory. While the study area was primarily selected because of its diverse geology, terrain and soils, it is also representative of the central Roper River region, and findings from the investigation will underpin and guide future agricultural development in the region.

Notes

Made available by via Publications (Legal Deposit) Act 2004 (NT)

Table of contents

Executive Summary; 1. Introduction; 2. Previous land resource investigations; 3. Methodology; 4. Climate; 5. Geology; 6. Landscapes; 7. Land units; 8. Land capability assessment; 9. Land management; 10. References; Appendices.

Language

English

Subject

soil survey; land resource assessment; land units; land capability assessment

Publisher name

Northern Territory Government

Place of publication

Palmerston

Edition

1

Series

Technical Report No. 3/2021

Format

208 pages : colour maps and illustrations ; 30cm

File type

application/pdf

ISBN

9781743502815

Use

Attribution International 4.0 (CC BY 4.0)

Copyright owner

Northern Territory Government

License

https://creativecommons.org/licenses/by/4.0/

Related links

http://www.ntlis.nt.gov.au/metadata/export_data?type=html&metadata_id=6589A5D125EFB385E050CD9B2144202B; https://hdl.handle.net/10070/820014 [Report_print_Soil Land Assessment Flying Fox - Part A Land Resources General Land Capability]; https://hdl.handle.net/10070/820013 [Report_screen_Soil Land Assessment Flying Fox - Part A Land Resources General Land Capability]; https://hdl.handle.net/10070/829192 [Soil and Land Assessment of the Southern Part of Flying Fox Station for Irrigated Agriculture. Part B: Digital Soil Mapping and Crop Specific Land Suitability]

Parent handle

https://hdl.handle.net/10070/820012

Citation address

https://hdl.handle.net/10070/820013

Related items

https://hdl.handle.net/10070/820014

Page content

Soil and Land Assessment of the Southern Part of Flying Fox Station for Irrigated Agriculture Part A: Land Resources and General Land Capability 122 development because of erosive flooding, extreme sodicity constraints in the upper profile (ESP >20, 0-0.5 m) and the presence of lower catchment riparian vegetation. Land Unit 9d (110 ha) occupies similar landscape positions (to Land Unit 9c3), but features self-mulching vertic clays developed on locally provenanced doleritic alluvium. It is directly connected with the wider receiving environment, and is characterised by high K factor values (0.04-0.06), high sediment delivery potential, low coherence (moderately to strongly selfmulching, medium clay surface horizons), moderately sodic upper profiles (ESP 6-15, 0-0.5 m) and slopes <1%. The unit is inappropriate for agricultural development because of erosive flooding, significant subsoil salinity and moderate sodicity constraints in the upper profile (ESP 6-15, 0-0.5 m). Land Unit 11e (490 ha) occupies ephemeral swamps within or along the margins of the central Roper system. The unit is part of the wider receiving environment, and is characterised by high K factor values (0.04-0.06), high sediment delivery potential, low coherence (weakly to strongly self-mulching, medium clay to heavy clay surface horizons), strongly sodic upper profiles (ESP 15-20, 0-0.5 m) and slopes <1%. The unit is inappropriate for agricultural development because of regular flooding, extended post-wet season inundation and waterlogging, significant subsoil salinity, severe sodicity constraints in the upper profile (ESP >15, 0-0.5 m) and the presence of riparian and/or wetland vegetation. Landscapes with a high very high water erosion hazard Land Unit 10e in river channels/channelled floodplains of the central Roper system. Land Unit 10e (4 590 ha) occupies active river channels and anastomosing channelled floodplain sections within the central Roper system. The unit is part of the wider receiving environment, and is characterised by very high K factor values (>0.06), high sediment delivery potential, high coherence (hardsetting, epipedal or occasionally self-mulching, light medium clay to heavy clay surface horizons), moderately sodic upper profiles (ESP 6-15, 0-0.5 m) and slopes <1-10%. The unit is inappropriate for agricultural development because of regular erosive flooding, highly erodible surface soils (due to elevated silt fractions), unacceptable slopes near incised channels, significant subsoil salinity, moderate sodicity constraints in the upper profile (ESP 6-15, 0-0.5 m) and the presence of riparian and/or wetland vegetation. 9.1.4 Requirements for supporting field evidence Where a combined category has been assigned (or a hazard category is incorrect because of mapping scale), it is possible localised areas of greater or lesser erosion hazard may be present at paddock scales. Targeted agricultural development may be possible in such local land pockets where sufficient evidence is available to establish that the land in question has a low to moderate erosion hazard. In such cases, paddock scale investigations would need to confirm that the subject land had a matrix score of 3-8, and was characterised (in the most part) by: moderate (K 0.02-0.04) or (at worst) high K factor values (K 0.04-0.06) score 2/3; low sediment delivery potential score 1; high surface soil coherence score 1; 1- 2% slope (low to moderate classes in the NT Land Clearing Guidelines(2020)) score 0/1;


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